Author of books:KGB: The Secret Work of Soviet Secret Agents (1974, nonfiction)Murder of a Gentle Land: The Untold Story of Communist Genocide in Cambodia (1977, with Anthony Paul)MiG Pilot: The Final Escape of Lieutenant Belenko (1980, nonfiction)KGB Today: The Hidden Hand (1983, nonfiction)Breaking the Ring: The Bizarre Case of the Walker Family Spy Ring (1987, nonfiction)Operation SOLO: The FBI's Man in the Kremlin (1996, nonfiction)